The Elections Bill has just received Royal Assent and so it has become the Elections Act 2022. Among other things it removes the 15-year rule for overseas voters, so we should soon all be able to register to vote in UK national elections.
It has been a very long haul, but now we have got there!
Votes for Expat Brits blog 
Thank you for such a positive response as well as demonstrating that registration as an overseas voter is already possible!
I am delighted. For years I have followed this saga .I have my registration confirmed with the help of MP and the local council librarian.